Lens-grinding machine.



S. W. & E. G. ROBINSON. 1:. a. ROBINSON & M. 3. THRAILKILL, nxncn'rons or s. w, ROBIN SON, DEO'D.

LENS GRINDING MACHINE.

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LENS GRINDING MACHINE.

APPLICATION FILED JULY 21, 1910.

Patented Mar. 21, 1911 2 SHEETS-SHEET 2.

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Specification of Letters Patent.

W. 'RQIBINSGN AI lD ERDIS G. ROB INSON, OF COLUMBUS. OHIO; ERDIS G. M. E. THBAILKILL EX ECUTORS 0F SAID STILLMAN W. ROBINSON,

Lens-GRINDIN MACHINE.

Patented Mar. 21, 1911.

Application filed July 21, 1919. Serial fie. 572,984.

To all whom it may-concern:

Be it known that we, STILLMA ll". Ronn'vson and Ennis G. RoBINsov, citizens of the United 'States,-residing at Columbus, in the county of Franklin and Stateof Ohio,

have invented certain new and useful 1m tel-described, adapted for the grinding of construction, combination and arrangement partly in'elevation and partly in section of either spherical, cylindrical, toric or other forms of lenses. g

.In' the present instance, it 18 our purpose to provide an improved-machine of simple,

durable and reliable construction and one wherein means are provided for regulatingthe pressure between the lens block and the lap andfor holding the lens block operating arm in an upright position when not in use.

A further object of our invention is to so construct the machine that the {stroke of the lens block'operating or carrying arm, may be adjusted'according to the character of the work being done: and the device for tensioning the lens block; being capable of adjustment during the operation of the machine.

Still another object of our invention is to "provide improved means for-stopping and starting the lap by raising and lowering the lap supporting table; and for operating the lap. A further object of our invention to provide a machine whereb the'lenses may be rapidly and aceuratelv ground.

With these and other objectsof a'similar nature in view, our invention consists in the of parts set forth in and falling within scope of theappended claims.

In the accompanying drawings: Figure 1 is aview in side elevation of a machine embodying our invention. the casing'on top of the frame or'table-being shown in section. Fig. 2 is a top plan view of'one'of the porttlOllS of the machine, Fig.3 is a front view our improved lens grinding machine, Fig. 4 is a vertical sectional viewtaken on the line 4% of Fig. 2, Fig :5 is a perspective view of the form of lap emploved for the production of toric lenses. Fig. (3 is a similar view of the form of lap employed for cv lindrical lenses, Fig. '4 is a view in perspective of the plate employed- .in grinding spherical lenses,'and, Fig. 8 is a view of the form 'of lap employed for spherical lenses. I

Referring now to the accompanying draw- .ings in detail the letter A designates-the frame or table of the machine as a whole,

said frame comprising the legs or standards 1 and2 and the top frame 3. Inthe top, on each side of the center of the length thereof, is formed a comparatively large opening l, designed for the purpose herein-- after described. In the machine as shown, it will be noted that we practically duplicate the operating parts, that is. one at, each side of the center of the length of the machine.

As these operating portions, are, as stated, practically duplicates, a descriptionof one will suiiice for both. 1

Depending from the underside of the top of the frame, are the vertical arms 5 pref-- erabl connected by suitable webs 6, said arms carrying a horizontal plate? from which depend the horizontal tubular bearings 8 adapted to receive the main power shaft 9 of the machine,' this shaft having a drive pulley at one end thereof. At each end of the hanger plate or barT, is avertical bearing 11 in which is rigidly supported the vertical shaft 12. the latter extendingup into the bore 13 of the revolving sleeve ll. Preferably formed integral with this sleeve, is a relatively large'disk 15 lying within the-opening l. The upper surface of the plate 15 is provided with an annular recess 17 and mounted upon such disk is a circular plate 18 having the lugs 19 and '20, i

the latter having an open slot 21. 1 The bolts or screws 22 and are employedto fasten Ithe plate rigidly to the disk. the slot 21 permining. the adjustment of such plate relatire to the disk. When the bolt -23 is at the inner or closed end of the slot 21, a pointwhich is central withreference to the length and breadth. of the platelS, is approximately opposite the center of the disk 15. But-when said bolt is atthe outer or open end of the'slot, it is obvious that the central part of the plate is eccentric with the center of the disk 15. The underside of the plate 18 is also-provided with an annular recess to correspond with the recess 17 in the plate 1'5, so that a space is formed as is shown at opening 4 therein, is the chamber 35 having the inclined diaphragm 36 provided with a central opening '37. A shaft 38 extends upward through the vertical tubular bearing 25 and-the cap surmounting the same, and through the opening 37 in the partition 36, this shaft being held' in place by the cotter pin 39' passing .transversely through the lower end thereof, while the upper end of the shaft carries the lap 40, the latter hava ing the socket 41 therein, for the reception of the end of the shaft and whereby said lap is detachable from the shaft. Integral with the shaft 38 or firmly secured thereto, is a flange or collar 33, resting at its lower side upon the upper ball bearing section 29 and onits upper side carrying thec-ap firmly secured as by screws.

42 designates a vertical oil duct in the shaft. terminating in the transverse duct 43 through the medium of which oil may be fed to the bearings of the cap, said vduct being closed by the plug 44.

The lens block of the machine is shown at 45 and is connected through the rod 46 with the block 47 slidable upon the arm' 48, which is extended from the segmental rack arm 49 pivoted as at- 50 to the lever 51. The block 47 is proyided with a curved arm 52 connected through a wire or the like 53,

with the lens block 45, for the purpose of steadying the same. It will be noted that the lens which is indicated at L, is held on. this block 45. One end of the arm 48 s provided with a handle 54, while the. segmental rack 49, has the upwardly extending that the driving disk is out of driving enlug 55.

56 designates an adjustable block carried by the segmental arm 49 and which is provided with a stud 57 said block being tensioned by the spring 58, one end of which is fast thereto at 59, while the opposite end is secured as at 60 to the lower portion of the arm 51, the tendency of the spring being to normally drawthe'rack and the arm 48 into the position shown in Fig. 1, while it will be observed that the arm may be thrown upward and backward through the medium of the handle 54 until after such arm has passed a certain point, when through the action and direction of the spring, such arm will be maintained in an approximately ver- 7 tical or open position away from the table.

The numeral 61 designates a shaft passing through, the lower ends of the levers 51, and

upon which shaft said'levers are rotatably mounted. This shaft 61 also, has thereon a two-part pulley comprising the relatively large member (32 and the smaller member 63.

The pulley section or member 62 is conuected through the drive belt 64 with the pulley 65 on the power shaft 9 at the front of the machine, while the smaller pulley section ()3 is in driving engagement through the endless belt 66 with the pulley'fi? mount- I arms '72 slotted at 7 3 and connected through links 74 with the arms 51; From the arrangement just described, it will be noted that motion is imparted from the shaft pulley 65, pulley section 63, drive belt 66, pitman (J9, arm 70, rock shaft 71, segmental arm 7 3 and link 7 4 to the lever 31, to impart a reciprocating motion to the lens carrying arm 48.- I

In addition to the reciprocating motion imparted to the arm carrying the lens block. it is also desired to impart to the lap block a none-.rotative curvilinear or movement and'to accomplish this n c employ the following mechanism. sleeve 14. at the lower end thereof. are the horizontally disposed friction disks T5 adapted to be rotatedby the friction wheels 76 splined on the power shaft 9, said friction wheels being capable of being moved radially toward nd from the center of the drive disks by means of the slidin yoke 77 connected'through the member 8, to increase or decrease the speed of the machine. the handle 79 of the yoke having the locking pin 80 through the medium of which the yoke may be fastened in the desired position upon the shaft 81 mounted in supports 82 at the front of the machine.

Referring to Figs. 1 and 3, 't will be noted gagement with the drive pulley T6. In order to put the same into operative driving engagement, we provide alever 8'3, a portion of said lever being bifurcated, the bifurcated end of the lever being pivoted at 83 near the rear of the frame. 86 designates a hook or other device at the front of the machine. through which the lever may be supported when drawn upward. thereby holding the disk out of drivin engagement with the driving pulley 76. ll ien it is desired to place the parts in driving engagement, the lE-VQIBQ is disengaged fromth'e hook 86 and the weight of the part lowers the sleeve 14.

wabbliug- Carried by the IOU so that the disk 75 contacts with the drive in thegrindingof a cylindrical lens, the lap receives a non rotative circular motion,

ries the disk 15 around in the opening 4,"

this movement also rotating the plate 18 fast on the disk 15. This rotation of the plate will have a tendencyto also revolve the cap 32 mounted thereon. But in order to prevent this rotation of the cap, and to cause its non-rotation, such that any point on its surface shall describe a circle of the same diameter; and that the successive positionsof any straight line drawn on the surface of the cap or the lap mounted thereon, shall remain parallel, we provide two parallel wires or rods, such as shown at 87, one end of each wire being fastened to the cap as at 88, while the opposite ends of the parallel wires are secured at 89. to the vertically extending arms 90, these arms being mounted upon the shaft fil'as at 91, and being connected through the cross yoke 92, in one piece, so that said arms are rocked slightly] upon the shaft 61 by reason of the resilient rods 8? connecting them to the non-rotatably moving cap 32. i

The above is a description of the mechanical construction of our machine and the operationof the same is as follows: Thelens blank to be ground is cemented or otherwise secured upon the lens block 4:5, the latter being. flexibly and noii-rotatably connected to the block 47, by members 16 and 53. The arm 48 carrying the lens block is now lowered into operative contact with the lap, by throwing the segmental rack arm 49 forward on its axis 50; the proper or desired pressure being obtained by adjusting the spring controlled sliding block 56 along the rack, said-block engaging with the notches of the rack. The lever 83 is then released from its hook S6 to bring the disk into contact with the frictionywheel 7 6. Power being applied to the shaft- 9 through the belt pulley 10, the disk 75 in its rotation turns the sleeve licarry'ing the disk 15, which rotates 1n the opening t. In grinding a cylindrical or toric lens, the plate 18'is offset so as to bececcentric to the disk 15, and said platebeing connected to the disk, will move in an eccentric path. The plate in its movement carries the shaft'38 hr the eccentric path, said shaft being connected to the cap 32 as by screws, or otherwise, this, shaft carrying the lap. The parallel wires connected to the cap and to the arms 90, hold such cap against rotation, and the rocking of the arms 90, and the resiliency of the spring wires 87 accommodate the movement imparted to the cap and shaft 38. This gives the lap a non-rotating circular motion, as previously described. The arm carrying the lens block is asheretoforedescribed, given a reciprocating motion back and forth through the lever 51 by the train of mechanism. mentioned. It willv thus be noted that chine.

while the leiisblock held against rotation, is

reciprocated back and forth across the same.

This enables the grinding of such a 'lens to be accomplished rapidly and accurately. I

\Vhen it is desired to grind'a spherical lens, we may dispense with the construction of cap and connections shown in Fig. 4 and em )lo\' the device shown in Fi 7. com rising the platelOO and the stud 101, in which case the plate is mounted concentric with the rotating disk 15, while a lap suchfas shown,

at 102, in Fig. 5, is employed.

\Vhil'e we have here n shown and described one cm'ibodiment of our invention way of-illustration, we wish it to be understood that -we do not limit ourselves to all the precise details herein set forth, as inodification and variation maybe made without nism mounted thereon including a lens holder, and means for imparting a non-rotating reciprocating movement thereto, a 1-0 tatmg member, a lap holder pivoted to said member eccentrically to the axis thereof, and

fielding connections betwe enthe holder and a fixed part wherebyall points oii thle' sui' face of the lap describe equal circles; aiidall successive positions of any .st-raight line drawn 011 the surface of the lap'rema'in' parallel during the operation" of the ma '2. The combination:with,a frame, of a non-rotating reciprocating lens holder, a

swinging member upon which said lens holder is mounted, a rotating member, a lap holder mounted on said member eccentric to the axis thereof, and yielding connections between the holder and a fixedpartwliereby i 3. In a lensgrinding machine, the combination with a frame having an opening therei1i, of a revolving member located in all points on the surface of the lap describe equal circles and all successive positions of said opening, a non-rotating member sup- 1 ported on the revolving member, a lap car-j revolving member, and means forraisi'ng power mechani m. N

4.; In a lens grinding machine," the combi nation with a fraine, of a rotating'n ember located in the open ng n said frame, a lap holder, a power mechanism for actuating ried by the non-rotating"member,- a lens holder, power mechanism for actuating theand lowering the revolving member to place the same in driving engagement with the" surface-"bf the lap demribe equal circles and all successive positions of any straight line drawnk 'pn the surface of the lap remain paralleh during the operation of-the machine, power 'mechamsm v for the. rotary i and for imparting the reciprocatmg movement to the lens holder, and means.

connected tothe support of the rotating V member .for lowering and raising said sup- I tofplaoe said member in-and out of engagement with the power mecha- 6. In alens'grindingmachine, the combi- ':nation with a frame, of a rotatable plate 'lying in. an o ningv-in the, frame, a non-v g 5-rotatmg menr r mounted on the rotating member, means for raising or. lowe'ringthe -rotfatable -member vertically, means for .var'yingthe speed of rotation of the rotating member, a lap carried. by the non-rotating ao member, anda lens holder reciprocating f across the'lap without rotation. 7. Ina. lens grinding machine, the combination with a frame having an opening therein, of a plate rotatably. mounted in said opening,aleasin surrounding the opening,

iafis'pindle exten ing into said plate and carrying -nonrotating members, a lap car'- f-ried by said spindle, a lens holder, and mechanism for reciprocating the lens holder across the lap without rotation.

'8. In a lens grinding machine, the combin'ation with a frame having an opening therein, a, revolving latemember moving in saidro'pening, aslaft upon which said 14'5' plate member 18 mounted, a second plate at the lower end of said shaft, means engaging with the second plate for varying the speed of rotation, a lap mounted above,

(v the revblving plate,-means for holding the 150 lap against rotation, a lens holder, and

means for moving said lens holder relative to the lap, without rotation.

'- 9.- In a lens indin machine, the combiv nation with a ame, tie lap block and the lens holder, of a plate mounted in an opening in the frame and carrying the lap block,

mechanism for imparting a rotary move ment to the plate' and-means arranged below the revolving plate for raising and lowering the latter in driving engagement with said mechanism.

j '10. In a lens grinding machine, the combination with a frame, a lap supported 'above the fram e, means for-'- imparting a' non-rotatmg curvilinear movement to thelap including a plurality of parallel rods, a rockin lever, an arm pivotally connected to saic lever, and a lens block adjustably mounted on said arm. f

11.In a lens grinding machine, the com- -bination with a frame, of a lap movably mounted thereon, wires or rods for preventing rotation of the lap, a rocking lever, an arm carried thereby, a lens holder 'mounted upon said arm, and means for varying the stroke of the lever. 12. In a lens grindingmachine, the combination with a frame, of a vertically adjustable rotating plate arranged in an opening in said frame, means for raising and 30 lowering the plate, a casing surrounding said plate, a cap mounted on the plate with- 111 the casing. a lap arranged above said cap, a pair of rods connected to the cap to prevent rotation of the lap, a lens holder 5 cooperating with the lap, and mechanism. for actuating the lens holder and the lap.

13. In a lens grinding machine, the combination with a frame, a power shaft carried thereby, a plate mounted within the frame, means for raising'and lowering the plate, means 011 the power shaft adapted to rot-ate the plate, a rocking lever, an arm- 1 carried by said lever, a lens holder mounted upon the arm, a lap beneath the holder, 9.5 wires or rods preventlng rotation of the lap, and means for actuating the lap andthe lens holder. I

14. In a lens grinding machine, the combination with a frame, a rota-table plate, a cap mounted on the plate, a lap arranged above the cap, a plurality of rocking a '11s, and two connecting rods between the cap and the arms whereby a non-rotative motion is imparted to the lap upon the rotation of the plate. Y 15. In a lens grinding machine,-the combination with a frame, a power shaft carried thereby, a vertically movable plate arranged above the power shaft, means for 110 rotating said plate, means for varying the speed of rotation of the plate, .a. laparranged above the plate, a lens holder, means for imparting a reciprocating non-rotating motion to the lens holder, and means including two connecting rods for imparting a non-rotative motion to the lap.

16. In a lens grinding machine, the combination with a frame, having an opening in the top thereof, a plate mounted to ro- 120 tate within said opening, a lap carried by the plate, wires or rods preventing rotation of the lap, a necking lever mounted on theframe, an arm pivoted to said lever, means for tensioning said arm, and a-lens holder mounted on the arm cooperating with the I lap.

ve 13o the plate provided with a diaphragm, a lap In testimony whereof we afiix our signamounted Within the casing, a reciprocating tures in presence of two Witnesses.

lens holder coiiperating with the lap, means STILLMAN W. ROBIN SOB. for imparting a circular non-rotative move- ERDIS G.- ROBINSON.

5 ment to the lap, means for varying the \Vitnesses:

speed of rotation of the plate', and m'eans l 'A L. PHELPS,

for varying the nr ssure of the'lens holder. 1 ING'LE A. liomus; 

